Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a9350d18649e51…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 02:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 05d03676353423e7858f47e142640529 SHA-1: 3368b6e94f8907cd56dff9849349ef11cf49c16d SHA-256: 63a9350d18649e5186c1bab553d4034ca5dd35a4d2e771d158b29cb0c7a4b08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tonymusic.se/UserFiles/files/49488243021.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e259060370---35067134362.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613172a6ba529---85923214233.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/23970361173.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140618a4ab97---sokijorifigoromujone.pdfIn PDF document text
    • https://jss-moms.si/upload/File/14343205167.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pizibo.pdfIn PDF document text
    • https://theipbuzz.com/images/file/mipiti.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403335bedfc---48407676450.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/tiluxepotowefugubunibu.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/gabesowekaviwoxazosulobu.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/67757537322.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161338d88e96ee---laxoresepumejewopapap.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/67138598586.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/niwav.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/fiwonoxagukizojokirivun.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/tatawenimunasi.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/89969565976.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6869b3402ba8a538fcf271e84b3db96c/97626568234.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4f6429dfd29660793c407f0a91db0e50/93090944106.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/21658655072.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/63342131557.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/83730808682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=watch+heartland+online+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B6 10396 bytes
SHA-256: d71a84e73178d26d34d3b689e34292b24aca8d694d91da50a6100df5f12acf4a
font_01_sfnt_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 17128 bytes
SHA-256: 9a2c2bd9b5e1442cfb61af2ab706a44c53adf9b617488f7288925e82894e79cc

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